# Stopwatch

> A stopwatch with start/stop and lap/reset buttons that times to the hundredth of a second and marks the fastest and slowest laps, ported to React from Sina UI's Svelte component by ebnsina.

- Author: [ebnsina](https://21st.dev/@ebnsina)
- Library: ebnsina
- License: MIT
- Tags: Stopwatch, Timer, Widget, Accessibility
- Live preview: https://21st.dev/@ebnsina/components/stopwatch

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/ebnsina/stopwatch?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/stopwatch.md